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Device and method for preparing pulverized coal with low energy consumption

A technology of pulverized coal and coking coal, applied in the steam generation method using heat carrier, coke cooling, petroleum industry, etc., can solve the problems of energy recovery, environmental pollution, etc., to save drying costs, reduce input, and solve dust pollution effect

Active Publication Date: 2013-12-04
SHAANXI COAL & CHEM TECH INST
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a device and method for preparing pulverized coal with low energy consumption. On the one hand, it solves the problems of energy recovery and environmental pollution in the pyrolysis semi-coke dry quenching method, and on the other hand, it reduces the drying process of raw coal with high water content. energy consumption

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  • Device and method for preparing pulverized coal with low energy consumption

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Comparison scheme
Effect test

Embodiment 1

[0031] After the lignite is fed and measured by the meter, it is mixed with the high-temperature semi-coke from the pulverized coal pyrolysis (raw coal particle size<6mm) device in the CDQ oven. The water content of the lignite is 34.5%, and the semi-coke temperature is 450- Between 550°C, the mass ratio of lignite to semi-coke is 1:9. At the same time, a mixed inert gas is introduced into the CDQ. Part of the sensible heat of the high-temperature semi-coke is absorbed by the lignite, and the rest is exchanged with the inert gas. This process Not only the lignite is dried, but also the semi-coke is cooled.

[0032] The high-temperature coke quenching gas from the top outlet of the CDQ enters the first-stage dust collector, and after the dust carried by the first-stage dust collector is removed, the first-stage dust removal gas is sent to the waste heat boiler, and the heat carried by the waste heat boiler gas heats the water The superheated steam is converted into superheated ...

Embodiment 2

[0035] After the low-rank coal is fed and measured by the meter, it is mixed with the high-temperature semi-coke from the lump coal pyrolysis (raw coal particle size>20mm) device in the CDQ oven. The water content of the low-rank coal is 16.8%, and the semi-coke The temperature is between 650-780°C, the mass ratio of bituminous coal to semi-coke is 5:5, and a mixed inert gas is introduced into the CDQ at the same time, part of the sensible heat of high-temperature semi-coke is absorbed by bituminous coal, and the rest is exchanged with inert gas heat, this process not only dries the raw coal but also cools the semi-coke.

[0036] The high-temperature coke quenching gas from the top outlet of the CDQ enters the first-stage dust collector, and after the dust carried by the first-stage dust collector is removed, the first-stage dust removal gas is sent to the waste heat boiler, and the heat carried by the waste heat boiler gas heats the water The superheated steam is converted in...

Embodiment 3

[0039] After the bituminous coal is fed and measured by the meter, it is mixed with the high-temperature semi-coke from the granular coal pyrolysis (raw coal particle size is 6-20mm) device in the CDQ oven. The water content of the bituminous coal is 11.3%, and the semi-coke temperature is Between 550-650°C, the mass ratio of bituminous coal to semi-coke is 4:6. At the same time, mixed inert gas is introduced into CDQ, part of the sensible heat of high-temperature semi-coke is absorbed by bituminous coal, and the rest is exchanged with inert gas. This process not only dries the raw coal but also cools the coke.

[0040] The high-temperature coke quenching gas from the top outlet of the CDQ enters the first-stage dust collector, and after the dust carried by the first-stage dust collector is removed, the first-stage dust removal gas is sent to the waste heat boiler, and the heat carried by the waste heat boiler gas heats the water The superheated steam is converted into superhe...

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Abstract

The invention provides a device and a method for preparing pulverized coal with low energy consumption. The device comprises a dry quenching cooling system, a heat energy recovery system and a coking coal grinding system, wherein the dry quenching cooling system comprises a dry quenching furnace. The dry quenching furnace takes high-temperature semi-coke generated by raw coal and a pyrolysis device as a raw material and inert gas as a heat exchange atmosphere, the high-temperature semi-coke reacts in the dry quenching furnace to obtain high-temperature quenching gas and a coal and coking coal mixture, a high-temperature quenching gas outlet of the dry quenching furnace is connected with an inlet of the heat energy recovery system, gas generated by the heat energy recovery system is recovered and returns to the dry quenching cooling system, and a coking coal mixture outlet of the dry quenching furnace is connected with an inlet of the coking coal grinding system to serve as the raw material for producing coking coal.

Description

technical field [0001] The invention relates to the field of coal processing, in particular to low-energy-consumption coal powder preparation and coking coal mixed pulverization technology, which can be directly used in the fields of coal powder processing and coal blending pulverization. Background technique [0002] Raw coal, especially coal with high water content, can only be processed and utilized after drying, resulting in a narrow range of raw material utilization and high processing costs. Raw coal with high moisture content is firstly dried to reduce its moisture and increase its calorific value, and then it is sent to a coal mill for grinding into qualified particles, which can be used in gasification, liquefaction, coking, electric power and other industries. The high water content and low calorific value of raw coal lead to relatively high direct transportation costs, and the drying process increases the cost of raw materials. Therefore, coal with high water cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B39/02C10B57/00C10B57/04F22B1/18B02C21/00
Inventor 徐婕郑化安方刚杨小彦张生军张建安李鑫巨鹏赵奕程
Owner SHAANXI COAL & CHEM TECH INST
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